元

yuán
  1. currency unit (esp. Chinese yuan)
  2. (bound form) first; original; primary
  3. (bound form) basic; fundamental
  4. (bound form) constituent; part
  5. (prefix) meta-
  6. (math.) argument; variable
  7. era (of a reign)
  8. (Tw) (geology) eon

CEDICT

math taiwan geology

Homographs

元 Yuán
  1. surname Yuan
  2. Yuan dynasty (1279–1368)